// src/services/monitoring.rs - 监控服务

use anyhow::Result;
use std::collections::HashMap;
use chrono::{Utc, Duration};
use serde::Serialize;

#[derive(Serialize)]
pub struct ServiceMetrics {
    pub timestamp: chrono::DateTime<Utc>,
    pub memory_usage_mb: f64,
    pub cpu_usage_percent: f64,
    pub active_connections: usize,
}

/// 系统监控服务
pub struct MonitoringService {
    metrics_history: HashMap<String, Vec<ServiceMetrics>>,
}

impl MonitoringService {
    pub fn new() -> Self {
        Self {
            metrics_history: HashMap::new(),
        }
    }

    /// 记录服务指标
    pub async fn record_metrics(&mut self, service_name: &str, metrics: ServiceMetrics) -> Result<()> {
        let history = self.metrics_history
            .entry(service_name.to_string())
            .or_insert_with(Vec::new);
        
        // 清理旧数据（保留最近24小时）
        let cutoff = Utc::now() - Duration::hours(24);
        history.retain(|m| m.timestamp > cutoff);
        
        history.push(metrics);
        Ok(())
    }

    /// 获取服务健康状态
    pub async fn get_health_status(&self, service_name: &str) -> Result<String> {
        // 简化实现
        Ok("healthy".to_string())
    }
}